JP2660076B2 - Female - Google Patents

Abstract

PCT No. PCT/SE89/00084 Sec. 371 Date Sep. 7, 1990 Sec. 102(e) Date Sep. 7, 1990 PCT Filed Feb. 27, 1989 PCT Pub. No. WO89/08429 PCT Pub. Date Sep. 21, 1989.A scalpel comprises a shank having a holder for releasably mounting a surgical blade. A ball of plastic material is formed by injection molding on the blade proper which consists of metal. The holder includes a sleeve, which is threadedly engaged with the shank at one end thereof and adapted to be screwed axially along the shank. The sleeve forms a ball socket, which is adapted to receive the ball of the blade therein. A clamping rod extends axially within the socket between the shank and the ball to engage and disengage said ball by the sleeve being screwed on the shank. The end of the clamping rod, which is adjacent to the ball, forms a circular sharp edge of a diameter which is substantially smaller than the diameter of the ball, thus cutting into the plastic material of the ball when the sleeve is screwed to engage the clamping rod with said ball.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scalpel having a shank having a holder for removably mounting a surgical blade, said holder being axially threaded along the shank to form a ball socket. , One end of which is threaded with the shank or the sleeve, and the ball of the blade to be received in the ball socket, and the socket in which the ball is engaged or disengaged from the ball by screwing the sleeve into the shank. And a clamp rod extending axially between the shank and the ball.

Such a scalpel is shown and described in Swiss Patent No. 490,072. The rod projecting from the shank and integral with the shank forms at its free end a seat that can engage with the ball of the blade by screwing the sleeve into the shank and partially receive the ball therein. The ball is clamped in a ball socket. The ball and ball socket form a universal joint, which allows the blade to be adjusted to different angles of the shank and locked at the desired angular position.

Many types of surgery have specific access issues, especially oral surgery (gingival surgery, wisdom tooth extraction, etc.)
This is true for joint surgery and surgical involvement in the ear, nose, and throat. In these cases, it is difficult to approach with a typical straight scalpel. It is necessary to use angled scalpels or reversed knives used, for example, in gingival surgery. Scalpels of the type described above have been proposed to allow special access in any kind of various surgical procedures.

In the prior art scalpel described above, the ball, and thus the blade, is locked in the desired angular position by the frictional engagement between the ball on the one hand and the ball seat and the ball socket on the other hand, and thus the angular position of the blade. It is necessary to tighten the sleeve tightly on the shank so that the position does not change or the blade does not become loose during use of the scalpel.

It is an object of the present invention to provide a scalpel of the type described above in which the blade is more securely fixed to the shank at the desired angular position. This is a very important requirement of oral surgery, and instruments of this type must never be loosened.

For this purpose, the scalpel of the present invention is characterized in that:
Has the characteristics described in (1).

In order to explain the present invention in more detail, embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a scalpel of the present invention; FIG. 2 is an enlarged side view of a blade and a member forming a circular sharp edge to be engaged with a ball; Is an axial section, FIG. 3 is a partially enlarged axial sectional view of a blade end of a scalpel without a blade, and FIG. 4 is a third section in which the blade is attached to a shank.
It is a figure similar to a figure.

The surgical blade shown in the accompanying drawings has a metal part 10 forming the actual blade (knife blade), on which a plastic body 11 is formed by injection molding, said plastic body comprising: Neck 12 and ball 13
To form The female shank 14 is provided with a sleeve 15 for mounting the blade, which forms a spherical ball socket 16 which is accessible from the outside through a lateral opening 17. Further, the sleeve has a slot 18 leading to an opening 17. To screw the sleeve onto the shank, the shank has a thickened end 19 with a bore 20 with internal threads. The sleeve 15 has an external thread that engages with the internal thread of the end 19 so that the sleeve can be rotated and thus axially moved into and out of the bore by screwing into the shank. . In the sleeve a clamping rod 21 is received, which has a circular sharp edge with a much smaller diameter than the ball 13
22 at the end adjacent to the ball socket (see FIG. 2). The other end of the clamping rod can be engaged at the bottom of the bore with the abutment surface 23 formed by the shank.

The ball 13 of the blade can be inserted into the ball socket 16 through the side opening 17. The ball can rotate freely within the ball socket to adjust the blade to the desired rotational or angular position, the neck 12 is received at an angle by the slot 18,
The ball is also bladed by axially screwing the sleeve 15 into the shank so that the circular sharp edge 22 of the clamp rod supported by the abutment surface 23 engages the ball and bites into the plastic material of the ball. Together with a desired position. Of course, the hardness of the plastic material (preferably a carbon fiber reinforced plastic material) must be selected to be less than the hardness of the normally metallic clamp rod so that the edges of the clamp rod can bite into the material. The blade 10 can be quickly locked in the desired position and angle "horizontally" over approximately two-thirds of the expected range. 360 blade
メ ス and the proper orientation of the blade in all possible positions, eliminating the need for several different scalpels. This can be easily done if the angular position at which the blade is locked is slightly changed. The sharp edge of the clamp rod cuts into the ball at a new location.
This can occur when the clamp rod engages the ball at a solid end and forms a recess in the ball,
There is no danger that the clamp rod will actively move the ball to its previous position. In such a case, the clamp rod tends to abut the bottom of the recess formed in the previous position, thereby causing the ball to rotate slightly to the previous position.

The ability to steplessly adjust the blade in the desired plane and angle allows for incisions to be made in many areas, approaching placement in the mouth and other cavities of the body. The surgical blade of the present invention can be manufactured at a very low cost because its mounting, receiving part consists of an injection-molded plastic part, so that the blade is an inexpensive disposable product, and thus when needed. Can be replaced at low cost,
It is fixed in its use position.

Preferably, the plastic body is made of a sterilizable plastic material, and the shank, sleeve and clamp rod are made of stainless steel.

Claims (3)

(57) [Claims] 1. A shank (14) having a holder for removably mounting a surgical blade (10), said holder being axially threaded along the shank;
By screwing a sleeve (15), screwed on one end with a shank, forming a ball socket (16), and a ball (13) of a blade of plastic material to be received in the ball socket, and screwing the sleeve onto the shank So that it engages and separates from the ball,
In a scalpel having a clamp rod extending axially between a shank and a ball in the socket, the end of the clamp rod adjacent to the ball forms a circular sharp edge (22) which thread the sleeve into. When the clamp rod is engaged with the ball with the ball, the ball is axially opposed to the ball so that the edge cuts into the plastic material of the ball properly molded by injection molding on a metal blade (10); A scalpel, wherein the ball has a diameter substantially smaller than the diameter. 2. The scalpel according to claim 1, wherein the sleeve (15) is screwed into a bore (20) formed by a shank. 3. The clamp rod (21) is connected to a sleeve (15).
And the ball (13) is received as a separate member by the bore (20) and the ball (13) and the shank (14) are engaged between the abutment surfaces (23) formed in the bottom of the bore. The scalpel according to claim (2).